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Lead-202

Properties and data of the isotope 202Pb.


Contents

See also: list of Lead isotopes.

 

General data

Name of the isotope:Lead-202; Pb-202Symbol:202Pb or 20282PbMass number A:202 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:120Isotopic mass:201.972152(4) u (atomic weight of Lead-202)Nuclide mass:201.9271736 u (calculated nuclear mass without electrons)Mass excess:-25.94024 MeVMass defect:1.709290544 u (per nucleus)Nuclear binding energy:1592.19388599 MeV (per nucleus)
7.88214795 MeV (average binding energy per nucleon)
Separation energy:SN = 8.741(14) MeV (first neutron)
SP = 6.049(15) MeV (first proton)
Half-life:52.5(28) × 103 aDecay constant λ:4.186581506607 × 10-13 s-1Specific activity α:1254337490.2685 Bq g-1
0.0339010132505 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Charge radius:5.4705(17) femtometer fmYear of discovery:1954

 

Radioactive Decay

Half-life T½ = 52.5(28) × 103 a respectively 1.65564 × 1012 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
EC202Tl99 %40(4) MeV MeV
α198Hg1 %2.589(4) MeV

 

Parent Nuclides

Direct parent isotopes are: 202Bi, 206Po.

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
202m1Pb2169.85(8) keV3.54(2) h9-
202m2Pb4091.0+x keV110(5) ns(16+)
202m3Pb5251.0+x keV107(3) ns(19-)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 120) and isobaric (same nucleon number A = 202) with Lead-202. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 120Isobar A = 202
73193Ta
74194W
75195Re
76196Os202Os
77197Ir202Ir
78198Pt202Pt
79199Au202Au
80200Hg202Hg
81201Tl202Tl
82202Pb202Pb
83203Bi202Bi
84204Po202Po
85205At202At
86206Rn202Rn
87207Fr202Fr
88208Ra202Ra
89209Ac
90210Th

 

External data and identifiers

Adopted Levels, Gammas:NuDat 202Pb

 


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Last update: 2020-10-22


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